"Since this morning 90 per cent of bets taken on the Brownlow have been on Mitchell.

"In a four-hour period we have taken bets to win more than $150,000 on him.

"A plunge this big is unheard of considering Gary Ablett has been a long odds-on favourite for most of the year."

Ablett remains favourite for the Medal with Joel Selwood behind. Mitchell has become a clear third favourite.

Brady has a solid history in successful Brownlow punting. He won more than $1 million following Chris Judd's 2010 victory and predicted the Jobe Watson-Trent Cotchin quinella last year winning $250,000.